Question about Harley Davidson FXR Super Glide Motorcycles

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Fxr 93 harley mixture screw adjustment from closed

How many turns last owner adjusted before forgot to count theturns

Posted by Anonymous on

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  • Harley Davidson Master
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Hi Anonymous, start with 2 full turns from bottom, adjust idle to 1,000 RPM then slowly back it more 1/4 of a turn at a time wait for engine to settle and repeat then another 1/4 turn then check idle for 1,000 RPM keep repeating the process until the idle quits going up then your good to go. Good luck

Posted on Apr 23, 2015

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Posted on Jan 02, 2017

cape cod bob
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SOURCE: rich mixture virago xv250

http://www.stadiumyamaha.com/pages/parts/viewbybrand/2/Yamaha.aspx

look up your bike here and i think it is number 13 on the diagram. which looks like its right by where the throttle cable connects

Posted on Mar 24, 2009

  • 1 Answer

SOURCE: looking for the air fuel mixture screws on carb any help?

[IMG]http://i199.photobucket.com/albums/aa59/88gixxer/100_4177.jpg[/IMG]

Posted on Apr 09, 2009

  • 3567 Answers

SOURCE: Hyosun Scooter Carb Adjustments

Very good thought process on the adjustments. The throttle screw sets the idle speed and the air screw sets the fuel mix at idle speed. The stock setting is 1.5 turns outward. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward.

From this point you adjust the idle speed then adjust the air screw for fastest idle speed at that throttle screw setting. If the idle speed becomes faster than desired after adjustment, just reset the throttle screw and then reset the air screw.

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Posted on Jun 27, 2009

  • 3567 Answers

SOURCE: where is the air/fuel mixture screw

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Posted on Jun 28, 2009

dmsr63
  • 2050 Answers

SOURCE: Mixture screw on Carb

I believe it is near the bottom, around where the float bowl meets the carb body.. You need a straight small screwdriver (Short) facing upward.

Posted on Jul 29, 2009

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There are 2 adjusting screws, one is idle speed and the other is mixture. Adjust the idle screw until it keeps running. That may be all you need. But to check that the mixture is right turn the mixture screw, quarter turn at a time, keep count! until it flutters or speeds up. If it speeds up stop and adjust the idle back a quarter turn at a time until it runs without the blade turning.

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Hi Darren, on the right hand side of the carburator there is an idle adjusting screw with a spring behind it, turn screw clockwise to increase idle counter clockwise to decrease idle. At the front of the carburetor on the bottom of the venturi bore there is also an air/fuel mixture screw inside a carb body lug that may or may not be plugged with an aluminum cap that's about 3/16" thick. This cap can be drilled out to acess the air/fuel mixture screw. Turning screw clockwise will lean out mixture and lower idle, turning screw counter clockwise will richen mixture and raise idle. Start by turning gently the screw clockwise until it just barley bottoms out then back it out 1 3/4 turns. You need to balance the two adjusting screws to obtain an idle of 950-1000 RPM then back out air/fuel mixture screw 1/8 turn, snap throttle to confirm responce, you may continue to back out air/fuel mixture screw untill desired throttle responce is achieved, if you see black smoke coming out of exhaust you have gone to far and need to turn screw back in 1/8 turn at a time, final adjustment should be made with the engine at normal operating temperature. For more information about your question please visit the websites below. Good luck and hace nice day.
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Hi, Anonymous it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal.
https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
7. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
8. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below and for more specific information or questions at no charge please feel free to contact me at xlch@mail.com. Good luck and have a wonderful day.
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I can't get the bike to idle at all. How do i fix this? i have tried messing with the idle screw, but it doesnt help.


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1 Answer

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Hi, Stevewright3 it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal.
https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
7. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
8. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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On 93 fxr had trouble with clucth felt like cable snapped but after checkin cable cable all good


your probly in need of aserius adjustment-or maybe a clutch overhaul-find an olshool guy in town or out not a dealersship-ride safe

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1 Answer

Idele / mixture screw adjustments


You'll need a handheld tachometer or tach/dwell meter if your car does not have a tachometer.

Start by adjusting the idle screw to the correct speed (do this with the car running) allow a few seconds between adjustments for changes to take effect. I don't know the specific speed for your car, but 800-900rpms is a good catch-all setting.

Next adjust the mixture screw open. Your idle speed will gradually increase as you open the mixture screw. Again, allow a few seconds between adjustments to check the results. I like to count the turns of the screw as I make them. I will usually make adjustments 1/4 turn at a time and count, so that if I adjust too far I can go back to a setting that I know worked.

Continue to adjust your mixture until it no longer causes the idle speed to increase, then take it back about 1/8th of a turn.

Now readjust your idle screw back down into the 800-900 range.

A word of advise before you start- carb tuning is pretty much last resort when troubleshooting your vehicle. In order, you should make sure all of the following is done first:

Visually inspect all vacuum lines for cracks, holes, or disconnections.

Check ignition components (plugs, wires, etc) I will check the wires by letting the car idle and misting water around the wires. (using an old pump hairspray bottle or water bottle, etc) Watch for a little fireworks show. This is easiest to see when it is at least partially dark in your work area.

Next check to make sure your ignition timing is within spec.


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